Aargh. I thought the over quota issues had been fixed :-( GAE is a great service, and it makes deploying and hosting an application dead simple, but how it actually works is a big mystery. GAE doesn't give any indication that your application is at or near the limit of a quota. Even now, while PrintWhatYouLike is giving over quota errors, the GAE dashboard for PrintWhatYouLike says that everything is a-ok. DocSavage, I wish I would have taken your advice a few weeks ago:)